:root {
  --bg-deep: #071023;
  --bg-mid: #0d1d3b;
  --bg-soft: #f4f7fb;
  --ink-main: #121a2b;
  --ink-sub: #51617c;
  --line: rgba(28, 53, 96, 0.22);
  --blue: #3d8dff;
  --blue-strong: #1f63d9;
  --mint: #3dc8b2;
  --panel: #0f1f3d;
  --panel-2: #132649;
  --white: #ffffff;
  --radius-lg: 24px;
  --radius-md: 16px;
  --shadow: 0 18px 55px rgba(8, 18, 42, 0.2);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Noto Sans JP", sans-serif;
  color: var(--ink-main);
  background: var(--bg-soft);
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(7, 16, 35, 0.84);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 78px;
  gap: 18px;
}

.brand {
  display: grid;
  color: var(--white);
}

.brand-kicker {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.08em;
}

.brand strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: 26px;
  letter-spacing: 0.01em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  color: rgba(255, 255, 255, 0.84);
  font-size: 14px;
}

.site-nav a {
  transition: color 0.22s ease;
}

.site-nav a:hover {
  color: var(--white);
}

.nav-cta {
  background: linear-gradient(135deg, var(--blue), #59a4ff);
  padding: 10px 16px;
  border-radius: 999px;
  color: var(--white);
}

.menu-btn {
  display: none;
}

.hero {
  position: relative;
  padding: 90px 0 72px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(72, 140, 245, 0.07) 1px, transparent 1px) 0 0 / 42px 42px,
    linear-gradient(rgba(72, 140, 245, 0.06) 1px, transparent 1px) 0 0 / 42px 42px,
    radial-gradient(circle at 18% 10%, rgba(61, 141, 255, 0.18), transparent 35%),
    radial-gradient(circle at 88% 18%, rgba(61, 200, 178, 0.14), transparent 28%),
    linear-gradient(140deg, #060d1c 15%, #0a1831 45%, #0c1f40 100%);
  color: var(--white);
}

.hero-bg-shape {
  position: absolute;
  pointer-events: none;
  border-radius: 999px;
  filter: blur(14px);
}

.hero-bg-shape-a {
  width: 220px;
  height: 220px;
  background: rgba(82, 157, 255, 0.22);
  top: 120px;
  right: -30px;
}

.hero-bg-shape-b {
  width: 240px;
  height: 240px;
  background: rgba(61, 200, 178, 0.2);
  bottom: -80px;
  left: -55px;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 30px;
  align-items: start;
}

.eyebrow,
.section-kicker {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
  font-weight: 700;
  color: #71afff;
  margin: 0 0 10px;
}

.hero h1 {
  margin: 0;
  font-size: clamp(34px, 4.9vw, 68px);
  line-height: 1.14;
  letter-spacing: -0.02em;
}

.hero h1 span {
  color: #66a8ff;
}

.hero-copy {
  max-width: 56ch;
  margin: 20px 0 0;
  color: rgba(235, 243, 255, 0.84);
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin: 30px 0 25px;
}

.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  border-radius: 999px;
  padding: 12px 20px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--blue-strong));
  box-shadow: 0 10px 30px rgba(41, 115, 235, 0.35);
}

.btn-ghost {
  color: #d3e6ff;
  border-color: rgba(144, 181, 234, 0.45);
  background: rgba(15, 32, 65, 0.42);
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.hero-metrics article {
  padding: 12px 14px;
  border: 1px solid rgba(151, 188, 242, 0.25);
  border-radius: var(--radius-md);
  background: rgba(16, 31, 59, 0.5);
}

.hero-metrics strong {
  font-family: "Space Grotesk", sans-serif;
  font-size: 21px;
}

.hero-metrics p {
  margin: 5px 0 0;
  font-size: 12px;
  color: rgba(225, 238, 255, 0.78);
}

.hero-panel {
  padding: 22px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(15, 33, 66, 0.92), rgba(11, 28, 58, 0.78));
  border: 1px solid rgba(137, 176, 235, 0.22);
  box-shadow: var(--shadow);
}

.panel-title {
  margin-top: 0;
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  letter-spacing: 0.03em;
}

.hero-panel ul {
  margin: 0;
  padding-left: 18px;
}

.hero-panel li {
  margin: 10px 0;
  color: rgba(228, 239, 255, 0.9);
}

.panel-link {
  display: inline-block;
  margin-top: 14px;
  color: #84b6ff;
  font-weight: 700;
}

.section {
  padding: 90px 0;
}

.section h2 {
  margin: 0;
  font-size: clamp(30px, 3.8vw, 50px);
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.section-lead {
  margin: 16px 0 0;
  color: var(--ink-sub);
  max-width: 70ch;
}

.section-light {
  background: var(--bg-soft);
}

.section-dark {
  background:
    linear-gradient(160deg, rgba(8, 18, 39, 0.98), rgba(14, 33, 68, 0.95)),
    radial-gradient(circle at 85% 8%, rgba(79, 137, 233, 0.22), transparent 30%);
  color: #ebf2ff;
}

.section-dark .section-kicker {
  color: #72adff;
}

.section-dark .section-lead {
  color: rgba(220, 234, 255, 0.83);
}

.grid {
  display: grid;
  gap: 16px;
  margin-top: 34px;
}

.cards-4 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.card,
.value-card,
.note,
.case-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 22px;
  box-shadow: 0 10px 25px rgba(10, 20, 40, 0.06);
}

.card h3,
.value-card h3,
.note h3,
.case-card h3 {
  margin: 0 0 8px;
  font-size: 23px;
}

.card p,
.value-card p,
.note p,
.case-card p {
  margin: 0;
  color: var(--ink-sub);
}

.cards-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.section-dark .value-card,
.section-dark .note,
.section-dark .case-card,
.section-dark .card {
  background: linear-gradient(160deg, #13294f 20%, #172f5a 100%);
  border-color: rgba(133, 167, 219, 0.3);
}

.section-dark .value-card p,
.section-dark .note p,
.section-dark .case-card p,
.section-dark .card p {
  color: rgba(221, 235, 255, 0.86);
}

.architecture-figure {
  margin: 30px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--white);
  box-shadow: 0 10px 28px rgba(10, 20, 40, 0.08);
}

.architecture-figure img {
  width: 100%;
  display: block;
}

.architecture-notes {
  margin-top: 20px;
}

.flow-list {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.flow-list li {
  padding: 22px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(133, 171, 227, 0.28);
  background: linear-gradient(145deg, rgba(19, 39, 76, 0.85), rgba(15, 32, 64, 0.92));
}

.flow-list h3 {
  margin: 0;
  font-size: 24px;
}

.flow-list p {
  margin: 8px 0 0;
  color: rgba(218, 233, 255, 0.84);
}

.cards-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.admin-proof {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.admin-proof article {
  background: var(--white);
  border-radius: var(--radius-md);
  border: 1px solid var(--line);
  overflow: hidden;
  box-shadow: 0 10px 26px rgba(10, 20, 40, 0.08);
}

.admin-proof img {
  width: 100%;
  display: block;
}

.admin-proof h3 {
  margin: 16px 18px 6px;
  font-size: 21px;
}

.admin-proof p {
  margin: 0 18px 18px;
  color: var(--ink-sub);
}

.llm-brief {
  background:
    linear-gradient(180deg, rgba(244, 247, 251, 0.92), rgba(232, 240, 252, 0.9)),
    radial-gradient(circle at 10% 15%, rgba(74, 139, 235, 0.1), transparent 35%);
}

.llm-brief-list {
  margin: 28px 0 0;
  display: grid;
  gap: 12px;
}

.llm-brief-list div {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.88);
  padding: 14px 16px;
}

.llm-brief-list dt {
  font-weight: 800;
  color: #16335f;
}

.llm-brief-list dd {
  margin: 6px 0 0;
  color: var(--ink-sub);
}

.faq-list {
  margin-top: 30px;
  display: grid;
  gap: 10px;
}

.faq-list details {
  border: 1px solid rgba(133, 172, 231, 0.34);
  border-radius: 12px;
  padding: 14px 16px;
  background: rgba(19, 39, 77, 0.85);
}

.faq-list summary {
  cursor: pointer;
  font-weight: 700;
}

.faq-list p {
  margin: 8px 0 0;
  color: rgba(221, 236, 255, 0.83);
}

.cta-band {
  background:
    linear-gradient(130deg, #0a1731, #10234a),
    radial-gradient(circle at 12% 15%, rgba(79, 140, 235, 0.32), transparent 35%);
  color: var(--white);
}

.cta-wrap {
  display: grid;
  grid-template-columns: 1fr 0.9fr;
  gap: 24px;
  align-items: center;
}

.contact-form {
  display: grid;
  gap: 12px;
  background: rgba(14, 30, 60, 0.78);
  border: 1px solid rgba(137, 176, 234, 0.35);
  border-radius: var(--radius-lg);
  padding: 18px;
}

.contact-form label {
  display: grid;
  gap: 6px;
  font-size: 13px;
}

.contact-form input {
  border: 1px solid rgba(139, 175, 232, 0.36);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.98);
  padding: 10px 12px;
  font-size: 15px;
}

.site-footer {
  background: #060d1d;
  color: rgba(235, 244, 255, 0.72);
  border-top: 1px solid rgba(121, 163, 224, 0.15);
}

.footer-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
}

.footer-meta p {
  margin: 0;
}

.operator-note {
  margin-top: 4px;
  font-size: 13px;
  color: rgba(228, 240, 255, 0.82);
}

.operator-note a {
  color: #8fc0ff;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1050px) {
  .site-nav {
    gap: 12px;
    font-size: 13px;
  }

  .hero-grid,
  .cta-wrap {
    grid-template-columns: 1fr;
  }

  .cards-3 {
    grid-template-columns: 1fr;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 820px) {
  .menu-btn {
    display: inline-flex;
    color: var(--white);
    border: 1px solid rgba(155, 191, 247, 0.42);
    background: rgba(20, 38, 73, 0.7);
    border-radius: 999px;
    padding: 8px 12px;
    font-weight: 700;
  }

  .site-nav {
    position: absolute;
    top: 77px;
    right: 4vw;
    left: 4vw;
    display: none;
    flex-direction: column;
    align-items: flex-start;
    padding: 14px;
    border-radius: var(--radius-md);
    background: rgba(7, 18, 39, 0.96);
    border: 1px solid rgba(129, 169, 228, 0.24);
  }

  .site-nav.is-open {
    display: flex;
  }

  .cards-4,
  .cards-2,
  .admin-proof {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 68px 0;
  }

  .hero {
    padding-top: 70px;
  }

  .hero h1 {
    font-size: clamp(33px, 8vw, 50px);
  }

  .footer-wrap {
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 0;
  }
}